Add for autocomplete guard when value is undefined

[EWhite613]

Overview

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Summary

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Checklist

• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have evaluated if the README.md documentation needs to be updated
• [ ] I have evaluated if the /tests/dummy/ app needs to be modified
• [ ] I have evaluated if DocBlock headers needed to be added or updated
• [ ] I have verified that lint and tests pass locally with my changes
• [ ] If a fork of a dependent package had to be made to address the issue this PR closes:
  • [ ] I noted in the fork's README.md the reason the fork was created
  • [ ] I have opened an upstream issue detailing what was deficient about the dependency
  • [ ] I have opened an upstream PR addressing this deficiency
  • [ ] I have opened an issue in this repository to track this PR and schedule the removal of the usage of the fork

Semver

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• [ ] #none#
• [x] #patch#
• [ ] #minor#
• [ ] #major#

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• NONE
  • README.md changes
  • test additions
  • changes to files that are not used by a consuming application (.travis.yml, .gitignore, etc)
• PATCH
  • backwards-compatible bug fix
  • nothing about how to use the code has changed
  • nothing about the outcome of the code has changed (though it likely corrected it)
  • changes to demo app (/tests/dummy/)
• MINOR
  • adding functionality in a backwards-compatible manner
  • nothing about how used to use the code has changed but using it in a new way will do new things
  • nothing about the outcome of the code has changed without having to first use it in a new way
  • addition of new CSS selectors
  • addition of new ember-hook selectors
• MAJOR
  • incompatible API change
  • using the code how used to will cease working
  • using the code how used to will have a different outcome
  • any changes to CSS selector names
  • any removal of CSS selectors
  • any changes to ember-hook selectors
  • possibly changes to test helpers (depends on the changes made)
  • any changes to the dependencies entry in the package.json file

CHANGELOG

• Fix add for autocomplete guard when value is undefined